Abstract: The invention relates to a mains power supply equipment for rubber-tired port container gantry cranes comprising a trolley line connected to a power supply network and a power system of the rubber-tired gantry crane, wherein the trolley line is erected fixedly and high in the air above the rubber-tired gantry crane, the position of the trolley line is higher than that of the container lorry, and on the trolley line is mounted movably a trolley shoe contacted electrically with the trolley line, and connected with the power system of the rubber-tired gantry crane through a wire.